Poyerekeza ndivalavu pachipata, valavu yapadziko lonse ndi mawonekedwe a valve, mbiri ya valve ya mpira ndi yayifupi kwambiri.Ngakhale kuti chivomerezo choyamba cha valve valve chinaperekedwa mu 1871, zidzatenga zaka 85 kuti valavu ya mpira ikhale yopambana.Polytetrafluoroethylene (PTFE, kapena "Teflon") idapezeka panthawi yopanga bomba la atomiki pa Nkhondo Yachiwiri Yapadziko Lonse, yomwe idzakhala chothandizira kuyambitsa makampani opanga ma valve a mpira.Mavavu a mpira amapezeka muzinthu zonse kuchokera ku mkuwa kupita ku carbon steel ndi zitsulo zosapanga dzimbiri mpaka zirconium.

Pali mitundu iwiri yofunikira: mipira yoyandama ndi mipira ya trunnion.Mapangidwe awiriwa amalola kupanga ma valve a mpira ogwira mtima kuchokera ku ¼ "mpaka 60" ndi kukulirapo.Nthawi zambiri, mapangidwe oyandama amagwiritsidwa ntchito pama valve ang'onoang'ono komanso otsika, pomwe mtundu wa trunnion umagwiritsidwa ntchito popanga ma valve akuluakulu komanso apamwamba.

VM SUM21 BALL API 6Dvalavu ya mpiraAPI 6D valavu ya mpira imagwiritsa ntchito mitundu iwiriyi ya ma valve a mpira chifukwa cha njira zawo zosindikizira komanso momwe mphamvu yamadzimadzi imayendera kuchokera ku payipi kupita ku mpira ndikugawa kumpando wa valve.Pakupanga mpira woyandama, mpirawo umakwanirana mwamphamvu pakati pa mipando iwiri, wina kumtunda ndi wina kunsi kwa mtsinje.Mphamvu yamadzimadzi imagwira mpirawo, ndikukankhira pampando wa valve womwe uli mu thupi la valve yotsika.Popeza mpira umakwirira dzenje lonse, mphamvu zonse zomwe zikuyenda zimakankhira mpirawo kuti uuumirize pampando wa valve.Ngati mpirawo ndi waukulu kwambiri ndipo kupanikizika kuli kwakukulu, mphamvu pampando wa valve idzakhala yaikulu, chifukwa chogwiritsira ntchito ndi chachikulu kwambiri ndipo valavu silingagwire ntchito.

Ma valve oyandama a mpira amakhala ndi masitayilo osiyanasiyana a thupi, koma otchuka kwambiri ndi mitundu iwiri yolowera kumapeto.Mitundu ina ya thupi imaphatikizapo magawo atatu ndi kulowa pamwamba.Ma valve oyandama amapangidwa mokulira mpaka 24 ″ ndi magiredi 300, koma mawonekedwe enieni a mavavu oyandama amakhala otsika kwambiri - kuchuluka kwake kumakhala pafupifupi 12 ″.

Ngakhale mavavu a mpira amapangidwa makamaka ngati ma valve on/off kapena “stop”, kuwonjezera ma valve ena a mpira ndi V-port.valavu ya mpiramapangidwe amawapangitsa kukhala abwino kwa mapulogalamu olamulidwa.

Mpando wowala
VM SUM21 BALL Flanged Ball Vavu yovundikira mpira Mavavu ang'onoang'ono oyandama atha kugwiritsidwa ntchito m'njira zosiyanasiyana, kuyambira mapaipi apakhomo mpaka mapaipi okhala ndi mankhwala ovuta kwambiri.Zodziwika bwino pampando mavavu awa ndi mtundu wina wa thermoplastic, monga PTFE.Mipando ya valve ya Teflon imagwira ntchito bwino chifukwa ndi yofewa mokwanira kuti isindikize bwino pamipira yachitsulo yopukutidwa, koma yamphamvu kuti isatuluke mu valve.Mavuto akulu awiri okhala ndi ma valve okhala ndi mipando yofewa ndikuti amakandwa mosavuta (ndipo amatha kuchucha), ndipo kutentha kumangokhala pansi pa malo osungunuka a mpando wa thermoplastic-mozungulira 450oF (232oC), kutengera malo okhala.

Mbali ina ya ma valve oyandama pamipando yoyandama ndikuti amatha kusindikizidwa bwino pakayaka moto womwe umapangitsa kuti mpando waukulu usungunuke.Izi zimatchedwa mapangidwe osawotcha moto;ili ndi thumba lapampando lomwe silimangokhala ndi mpando wotanuka, komanso limapereka mpando wachitsulo pamwamba pazitsulo zomwe zimapereka chisindikizo chapadera pamene zimagwirizana ndi mpira.Malingana ndi American Petroleum Institute (API) 607 kapena 6FA miyezo yoyesera moto, valavu imayesedwa kuti itsimikizire mapangidwe a chitetezo cha moto.

Trunnion design
VM SUM21 BALL API 6D trunnion ball valve API 6D trunnion ball valve Pamene valavu yokulirapo komanso yothamanga kwambiri ikufunika, mapangidwewo amatembenukira ku mtundu wa trunnion.Kusiyanitsa pakati pa trunnion ndi mtundu woyandama ndikuti mpira wa trunnion umakhazikika m'thupi lalikulu ndi trunnion yapansi (ndodo yaying'ono yolumikizira) ndi ndodo yapamwamba.Popeza mpira sungathe "kuyandama" mumpando wa valve kuti utseke mokakamiza, mpando wa valve uyenera kuyandama pa mpirawo.Mapangidwe a mpando wa trunnion amachititsa kuti mpando ukhale wolimbikitsidwa ndi kuthamanga kwa mtsinje ndikukakamizika kulowa m'bwalo kuti asindikize.Chifukwa mpirawo umakhala wokhazikika pamalo ake, kupatulapo kusinthasintha kwake kwa 90o, mphamvu yamadzimadzi ndi kupanikizika kodabwitsa sikudzasokoneza mpirawo pampando wa valve.M'malo mwake, mphamvuyo imangogwira malo aang'ono kunja kwa mpando woyandama.

VM SUM21 BALL Mapeto opangira cholowera Mapeto opangira ma trunnion mpira valavu ndi mchimwene wamkulu wamphamvu wa valavu yoyandama ya mpira, kotero imatha kugwira ntchito zazikulu-kuthamanga kwambiri komanso ma diameter akulu a chitoliro.Pofika pano, ntchito yotchuka kwambiri ya ma valve a mpira wa trunnion ndi ntchito zapaipi.